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A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.

ABSTRACT: The battery chemistry aiming for high energy density calls for the redox couples that embrace multi-electron transfer with high redox potential. Here we report a twelve-electron transfer iodine electrode based on the conversion between iodide and iodate in aqueous electrolyte, which is six times than that of the conventional iodide/iodine redox couple. This is enabled by interhalogen chemistry between iodine (in the electrode) and bromide (in the acidic electrolyte), which provides an electrochemical-chemical loop (the bromide-iodate loop) that accelerates the kinetics and reversibility of the iodide/iodate electrode reaction. In the deliberately designed aqueous electrolyte, the twelve-electron iodine electrode delivers a high specific capacity of 1200 mAh g^-1 with good reversibility, corresponding to a high energy density of 1357 Wh kg^-1. The proposed iodine electrode is substantially promising for the design of future high energy density aqueous batteries, as validated by the zinc-iodine full battery and the acid-alkaline decoupling battery.

SUBMITTER: Ma W

PROVIDER: S-EPMC10484974 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.

Ma Wenjiao W Liu Tingting T Xu Chen C Lei Chengjun C Jiang Pengjie P He Xin X Liang Xiao X

Nature communications 20230907 1

The battery chemistry aiming for high energy density calls for the redox couples that embrace multi-electron transfer with high redox potential. Here we report a twelve-electron transfer iodine electrode based on the conversion between iodide and iodate in aqueous electrolyte, which is six times than that of the conventional iodide/iodine redox couple. This is enabled by interhalogen chemistry between iodine (in the electrode) and bromide (in the acidic electrolyte), which provides an electroche ...[more]

PMID: 37679335

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A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.

Publications

A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.

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